Lunt LS40FHa 40mm Front-Mounted Double Stack Solar Filter

Lunt LS40FHa 40mm Front-Mounted Double Stack Solar Filter

The Lunt LS40FHa Solar Filter features a 40 mm aperture with no central obstruction and an integrally tuned etalon, designed specifically for Lunt Dedicated 40 mm Telescopes.

This Double Stack Unit is meant for use with the Lunt 40mm Dedicated Hydrogen Alpha System and requires a Lunt Solar Systems Blocking Filter (essential for safe operation).

With a bandpass of <0.70 Angstrom, the LS40FHa delivers high-contrast views of solar surface and limb details. When double-stacked, the bandpass narrows to ~<0.50 Angstrom, significantly enhancing resolution for both visual observation and imaging.

LS40FHa Specifications (Single Filter):

   ➤  Optical Aperture: 40 mm

   ➤  Etalon: <0.50 Angstrom (as Double-Stack)

   ➤  Tuning: Tilt

   ➤  Focal Length: 400 mm (unchanged)

   ➤  Filter Storage: Compatible with optional aluminum hard case with fitted foam for LS40mm

   ➤  Filter Weight: ~1 lb (~0.4 kg)